RCS1221: Use pattern matching instead of combination of 'as' operator and null check

Properties

Property	Value
Default Severity	Info
Minimum language version	7.0

Examples

Example #1

diagnostic.cs

var y = x as Foo;

if (y == null)
{
    return;
}

fix.cs

if (!(x is Foo y))
{
    return;
}

Applies to

• Extension for VS 2022
• Extension for VS Code
• Extension for Open VSX
• Package Roslynator.Analyzers